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In Chinese idioms, Pinyin is d ě ng é RXi à zh ī, meaning from this level to the next. It comes from Zhu Xi's Zhu Zi Yu Lei in Song Dynasty.
The origin of Idioms
Zhu Xi's Zhu Zi Yu Lei of the Song Dynasty (Volume 65): "if it comes down to the same level, like the theory of medical technology and health preservation, it is inseparable from both yin and Yang."
Idiom usage
Contraction; predicate; derogatory. Example song louyao's collection of attacking shame: the poor in the countryside, or less than this, should be treated in this way. Sun Li's xiuluji. Correspondence about Ji Yun: his practice is more inferior to Ji Yun's.
Chinese PinYin : děng ér xià zhī
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One's worth may be one's own ruin. shān mù zì kòu